KIA Niro: Pressure Source Unit Repair procedures

Pressure Source Unit Components and components location

Warning

Warning

PSU (Presser Source Unit) must not be disassembled.

  1. Pressure Source Unit (PSU)
  2. Pressure Source Unit (PSU) connector
  3. Motor
  4. Filler adapter
  5. Bracket
  6. Accumulator

Removal

Warning

The following section describes how to diagnose faults using a diagnostic instrument.

1) Connect self-diagnosis connector (16pins) located under the driver side crash pad to self-diagnosis device, and then turn the self-diagnosis device after key is ON.

2) Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.

3) Select the "High Pressure Release Mode" on KDS screen, then select OK.

4) Proceed with the test according to the screen instructions.

  1. Turn ignition switch OFF and disconnect the negative (-) battery terminal.
  2. Remove the air cleaner assembly.

    (Refer to Engine Mechanical System - "Air Cleaner")

  3. Remove the brake fluid from the master cylinder reservoir with a syringe.

Warning

Do not spill brake fluid on the vehicle as it may damage the paint. If brake fluid comes in contact with the paint, wash off immediately with water.

  1. Remove the connector and wire ring bracket.

  1. Loosen the pressure source unit (PSU) flare nut (A) and then remove the tube.

Tightening torque: 12.7 - 16.7 N*m (1.3 - 1.7 kgf*m, 9.4 - 12.3 lb*ft)

  1. Disconnect the pressure source unit (PSU) connector (A) and hose (B).

  1. Remove the sub frame.

    (Refer to Suspension System - "Sub Frame")

  2. Loosen the nuts and bolt and then remove the pressure source (PSU).

Tightening torque: 19.6 - 29.4 N*m (2.0 - 3.0 kgf*m, 14.5 - 21.7 lb*ft)

Installation

Installation

  1. Installation is the reverse of removal.
  2. Check the brake pedal operation.
  3. After filling the brake fluid in the reservoir, perform the air bleed.

    (Refer to the Brake system - "Brake Bleeding Procedure")

  4. Conduct the pedal traval sensor (PTS) calibration.

    (Refer to the Brake System - "Brake Pedal")

  5. Conduct the pressure sensor calibration.

Diagnostic Procedure Using a Diagnostic Instrument

The following section describes how to diagnose faults using a diagnostic instrument.

  1. Connect self-diagnosis connector (16pins) located under the driver side crash pad to self
  2. Select the "vehicle model" and "ESC/AHB" on KDS vehicle selection screen.
  3. Proceed with the test according to the screen instructions.

Pressure Sensor Calibration

Pedal Travel Sensor (PTS) Calibration

Pedal Travel Sensor (PTS) Calibration

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